Bicycle Front Fork Linkage Suspension Design
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Solution Overview
Problem
Traditional bicycle front forks, such as telescoping tube forks and flexing member forks, are either expensive and complex, inefficient for small suspension travel, or result in imprecise steering due to independent movement of lower members, leading to increased aerodynamic drag and power loss during pedaling.
Innovation Solution
The design incorporates an upper and lower fork with a linkage assembly and springs, allowing the lower fork to move relative to the upper fork, reducing breakaway force and aerodynamic drag, and utilizing shear springs for shock absorption, enabling more responsive vibration dampening and streamlined aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional telescoping tube forks are used, then suspension function is provided, but the structure becomes expensive and complex
Solution Approach 1:
The front fork is divided into an upper fork assembly and a lower fork assembly that can move independently relative to each other. The lower fork assembly includes the fork legs and wheel assembly, while the upper fork assembly includes the steerer tube and handlebar stem. This segmentation allows the lower fork to swing independently to absorb shocks while maintaining a simpler overall structure compared to traditional telescoping tube forks.
Solution Approach 2:
The patent introduces a dynamic suspension mechanism where the lower fork assembly can swing relative to the upper fork assembly through a linkage system. This dynamic movement allows the fork to adapt to terrain variations and absorb shocks, providing reliable suspension function without requiring a complex telescoping tube structure with multiple sealed chambers.
2Reliability
If traditional flexing member forks are used, then some suspension is provided, but they are inefficient for small suspension travel
Solution Approach 1:
The patent implements a dynamic swinging mechanism where the lower fork assembly can swing relative to the upper fork assembly through a linkage system. This dynamic movement allows the fork to adapt to terrain variations and absorb shocks efficiently, providing reliable suspension function without requiring a complex telescoping tube structure with multiple sealed chambers.
Solution Approach 2:
The patent optimizes the suspension travel parameters by configuring the linkage assembly and spring system to provide effective small-travel suspension suitable for road and hybrid bicycles. The spring constant and linkage geometry are designed to maximize suspension efficiency for the specific travel range required, making the system highly productive for its intended application.
3Adaptability or versatility
If independent lower members are used, then flexibility is increased, but steering precision decreases due to imprecise steering
Solution Approach 1:
The front fork is divided into an upper fork assembly and a lower fork assembly that can move independently relative to each other. The lower fork assembly includes the fork legs and wheel assembly, while the upper fork assembly includes the steerer tube and handlebar stem. This segmentation allows the lower fork to swing independently to absorb shocks while maintaining a simpler overall structure compared to traditional telescoping tube forks.
Solution Approach 2:
The patent introduces a linkage assembly that acts as an intermediary between the upper and lower fork assemblies. This linkage system, combined with the spring mechanism, mediates the interaction between the two assemblies, allowing the lower fork to move independently for shock absorption while maintaining precise steering control through the upper fork and steerer tube.
4Reliability
If traditional front fork designs are used, then suspension is provided, but aerodynamic drag and power loss increase
Solution Approach 1:
The patent implements a dynamic swinging mechanism where the lower fork assembly can swing relative to the upper fork assembly through a linkage system. This dynamic movement allows the fork to adapt to terrain variations and absorb shocks efficiently, providing reliable suspension function without requiring a complex telescoping tube structure with multiple sealed chambers.
Solution Approach 2:
The patent optimizes the suspension travel parameters by configuring the linkage assembly and spring system to provide effective small-travel suspension suitable for road and hybrid bicycles. The spring constant and linkage geometry are designed to maximize suspension efficiency for the specific travel range required, making the system highly productive for its intended application.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the bicycle's responsiveness to shocks and vibrations, reduces aerodynamic drag, and optimizes suspension travel for road and hybrid bicycles, providing improved ride quality and efficiency.
Implementation Method 1
a spring in the steerer tube. The spring is configured to bias the lower fork away from the steer tube
Implementation Method 2
a first shear spring disposed between the first leg and the third leg and a second shear spring disposed between the second leg and the fourth leg. The first and second shear springs are configured to bias the lower fork away from the upper fork
Data Source
AI summary
Front forks for bicycles are described herein. An example front fork includes an upper fork including a first leg and a second leg, a lower fork including a third leg disposed along the first leg and a fourth leg disposed along the second leg, a first set of links rotatably coupled between the first leg and the third leg, and a second set of links rotatably coupled between the second leg and the fourth leg. The first and second sets of links enable the lower fork to swing relative to the upper fork. The front fork also includes a steerer tube coupled to the front fork and a spring in the steerer tube. The spring is configured to bias the lower fork away from the steer tube.